HP 971A User manual

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HP 971A Multimeter
User’s Guide
Part Number 00971-90002
March 1995
© Copyright Hewlett-Packard Company 1994, 1995
All Rights Reserved

HP 971A Multimeter
Table of Contents
SafetySummary. .. .. .. .. .. .. .. 1-4
SafetySymbols . .. .. .. .. .. .. .1-4
Maximum Overvoltage Limitations...1-5
ProbesandTestLeads. .. .. .. .. 1-6
Operation. . . . . . . . . . . . . . . . . . . 1-7
Terminals,Shutter, & Test Leads...1-7
FunctionSwitch . .. .. .. .. .. .. .1-8
FunctionKeys. .. .. .. .. .. .. .. 1-9
Function Keys/Function Switch Matrix ..1-12
Display. .. .. .. .. .. .. .. .. .. 1-13
Audio . .. .. .. .. .. .. .. .. .. .1-13
CalibrationandAdjustment . .. .. .. .1-14
RequiredTestEquipment . .. .. .. .1-14
CalibrationProcedure . .. .. .. .. .1-14
Maintenance. .. .. .. .. .. .. .. .. 1-15
BatteryReplacement. .. .. .. .. .. 1-15
FuseReplacement . .. .. .. .. .. .1-15
Troubleshooting . .. .. .. .. .. .. .1-16
Cleaning . .. .. .. .. .. .. .. .. .1-16
Replaceable Parts/Accessories ....1-16
Specifications . .. .. .. .. .. .. .. .1-17
General. . . . . . . . . . . . . . . . . . . 1-17
DCVoltage. . . . . . . . . . . . . . . . . 1-17
ACVoltage. .. .. .. .. .. .. .. .1-18
DCCurrent. . . . . . . . . . . . . . . . . 1-18
ACCurrent. .. .. .. .. .. .. .. .1-19
Resistance. . . . . . . . . . . . . . . . . 1-19
Continuity . .. .. .. .. .. .. .. .. .1-19
Diode . .. .. .. .. .. .. .. .. .. .1-20
Temperature. . . . . . . . . . . . . . . 1-20
Frequency. . . . . . . . . . . . . . . . . 1-20
Adjustments. . . . . . . . . . . . . . . . . 6-1
CalibrationTable. . . . . . . . . . . . . . . 6-2
Replaceable Parts/Accessories ......6-4
Disassembly . .. .. .. .. .. .. .. .6-5
DeclarationofConformity
1-3

Safety Summary
The CAUTIONS and WARNINGS which appear on the following pages must be followed to
ensure operator safety and to retain the operating condition of the Multimeter.
1. Do not use this product beyond its specifications or for uses not intended for this product
as identified by the product functions, ranges, and hazards as indicted below.
2. To minimize possible electric shock hazard condition, connect only two leads at any one
time to any of the multimeter terminals.
3. To prevent possible electric shock hazard condition when using the current function, do not
leave one probe connected to the circuit under test and the other probe disconnected,
exposed, and readily accessible (touchable).
Safety Symbols
Indicates the operator must refer to an explanation in this manual.
Indicates terminals at which dangerous voltages may exist.
WARNING
TO AVOID ELECTRICAL SHOCK or damage to the multimeter, do not apply more than
±1000 Vdc or 1000 Vrms between any terminal and earth ground. Use caution when working with
voltages above 60 Vdc or 42 Vpeak. Ensure test leads are in good condition.
WARNING
POSSIBLE ELECTRICAL SHOCK. Do not make measurements if the case is damaged or the
rear cover is removed. Remove all electrical inputs before removing the rear cover.
WARNING
POSSIBLE ELECTRICAL SHOCK or FIRE HAZARD. Do not expose this multimeter to rain or
moisture. Do not operate the multimeter in the presence of flammable gases or fumes.
1-4

WARNING
POSSIBLE ELECTRICAL SHOCK. Calibration and performance tests are to be performed by
qualified personnel only. Do not attempt calibration or test procedures unless qualified to do so.
CAUTION
To avoid damage to the multimeter for inputs above 250 Vdc or Vac, disconnect the test leads
before changing functions. Do not exceed the maximum input limits.
Maximum Overvoltage Limitations (AC and DC Voltage Functions)
1000V
MAX indicates the maximum voltage between input terminals and earth is ±1000 V (dc or ac rms).
Do not use the multimeter on any ACV circuit where the maximum impulse overvoltage may
be more than 4000Vpk or any DCV circuit where the maximum impulse overvoltage may be
more than 2500Vpk between the COM and VOLT terminals. Excessive impulse overvoltage
can damage the multimeter voltage functions. Do not measure branch circuits (CAT 11) over
600V to earth or service panel circuits (CAT III) over 300V to earth.
Safety Summary
1-5

Function Maximum Operating Input
10 A ±10 A (dc or ac rms) / 600 V
mA or µA±500 mA (dc or ac rms) / 250 V
Diode Test, Resistance
Continuity, Temperature 660 Vrms (sinewave)
Frequency 660 Vrms (5 Hz to 10 kHz)
100 Vrms (10 kHz to 100 kHz)
V ±1000 Vdc or Vrms (sinewave)
Probes and Test Leads
1. Always inspect probes before use. Do not use test leads whose insulation has cuts,
cracks, or other damage that may result in reduced electric shock protection.
2. Keep insulation surface clean between the probe tip connector and the finger guards.
3. If probes other than the ones specified are to be used with the multimeter, be sure the
probes and their leads are rated for the voltage and current to which they will be subjected.
Do not exceed the voltage ratings for the multimeter.
4. Probes supplied with this multimeter are rated for use up to 1000Vrms or Vdc.
Safety Summary
1-6

Operation
Terminals, Shutter, & Test Leads
RED LEAD
Current Measurements
(0 A to 10 A)
RED LEAD
Current Measurements
(0 to 400 mA)
BLACK LEAD
COMMON
ALL Measurements
RED LEAD
DC & AC Voltage,
Diode, Resistance, Frequency,
Temperature, and Continuity
Measurements
SAFETY SHUTTER
Slide up to open shutters
for current measurement
inputs. Must have the
function switch in one of
the Current Measurement
positions to open shutter.
Close shutter to change
function switch to any
other measurement
function.
1-7

Function Switch
Switch
Position Display
10A DC Current
(10 mA to 10 A) AC Current (10 mA to 10 A)
mA DC Current
(10 µA to 0.4 A) AC Current (10 µA to 0.4 A)
µADC Current
(0.1 µA to 4 mA) AC Current (0.1 µA to 4 mA)
Diode Test
(0 to 2 V) Auto Diode Test
( 0 to ±2 V)
ΩResistance
(0.1 Ωto 40 MΩ)Continuity (alarm at < 20 Ω)Temperature in °F
(-112°F to 302°F) Temperature in °C (-80°C to 150°C)
Hz Frequency
(5 Hz to 99.9 kHz)
mV DC volts
(100 µV to 400 mV) AC volts (100 µV to 400 mV)
VDC Volts
(1 mV to 1000 V)
VAC volts
(1 mV to 1000 V)
Operation
1-8

Function Keys
Power
Automatic power off/power save after 30 minutes. Alarm sounds 30 seconds before power off.
Power off if input < 80 V or < 400 mA. Power save if input > 80 V or > 400 mA, last measurement
displayed, power consumption is reduced. Press any key or change any function to cancel. Defeat
by holding the key for 2 seconds while applying power.
Relative/Percent
Press Action Main Display Secondary
Display
Makes the last displayed
measurement the reference Each measured value relative to the reference value (difference) Range
Calculates the percentage change
from the reference Each measured value as a percent change of the reference value Range
Cancels the Relative/% function Measured value Range
Perform a zero adjust on the 400 Ω range and displayed value is less than 99 by shorting the test leads and
pressing this key. Cycle power to erase the stored zero adjustment.
Operation
1-9